摘要:
A system comprising at least one receiving station (1) and end user terminals (25) connected to the at least one receiving station (1) via a cable television network (11, 24, 30). The system is provided with transmission means comprising modulation means (35; 42, 43; 50; 60; 70) designed for downstream signal transfer towards the end user terminals (25) and for upstream signal transfer away from the end user terminals (25). The modulation means (35; 42, 43; 50; 60; 70) are designed for direct quadrature amplitude modulation whereby an information signal that is to be modulated is directly modulated on a carrier wave signal to be transmitted over the cable television network (11, 24, 30) in the frequency range above approximately 100 MHz. The transmission means may be used for long-distance as well as for in-house cable television systems.
摘要:
A fluid flow monitoring method and a fluid flow monitoring device (10) comprising a fluid passage (18) having a fluid input (13) and a fluid output (15), a fluid flow detection device (19, 20, 24, 25, 27) arranged for detecting fluid flow through the passage (18), and an electronic control circuit (23). The electronic control circuit (23) operatively connects to the fluid flow detection device (19, 20 24, 25, 27). The fluid flow detection device (19, 20 24, 25, 27) is arranged for establishing absence and presence of fluid flow through the fluid passage (18) and for providing signalling of an operational state of the fluid flow by operating presentation means (23) when a user is sensed in the vicinity of the fluid flow monitoring device (10).